MDCT audio coding with pulse vector quantizers
2015
This paper describes a novel audio coding algorithm that is a building block in the recently standardized 3GPP EVS codec [1]. The presented scheme operates in the Modified Discrete Cosine Transform (MDCT) domain and deploys a Split-PVQ pulse coding quantizer, a noise-fill, and a gain control optimized for the quantizer's properties. A complexity analysis in terms of WMOPS is presented to illustrate that the proposed Split-PVQ concept and dynamic range optimized MPVQ-indexing are suitable for real-time audio coding. Test results from formal MOS subjective evaluations and objective performance figures are presented to illustrate the competitiveness of the proposed algorithm.
Keywords:
- Shannon–Fano coding
- Theoretical computer science
- Speech recognition
- Transform coding
- Sub-band coding
- Artificial intelligence
- Speech coding
- Pattern recognition
- Coding tree unit
- Harmonic Vector Excitation Coding
- MPEG-4 Part 3
- Adaptive Multi-Rate audio codec
- Computer science
- Modified discrete cosine transform
- Variable-length code
- Algorithm
- Correction
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